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/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU General Public License v.2.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "lib.h"
#include "pv_map.h"
#include "pv_alloc.h"
/*
* Areas are maintained in size order, largest first.
*/
static void _insert_area(struct list *head, struct pv_area *a)
{
struct pv_area *pva;
list_iterate_items(pva, head) {
if (a->count > pva->count)
break;
}
list_add(&pva->list, &a->list);
}
static int _create_single_area(struct dm_pool *mem, struct pv_map *pvm,
uint32_t start, uint32_t length)
{
struct pv_area *pva;
if (!(pva = dm_pool_zalloc(mem, sizeof(*pva)))) {
stack;
return 0;
}
log_debug("Allowing allocation on %s start PE %" PRIu32 " length %"
PRIu32, dev_name(pvm->pv->dev), start, length);
pva->map = pvm;
pva->start = start;
pva->count = length;
_insert_area(&pvm->areas, pva);
return 1;
}
static int _create_alloc_areas_for_pv(struct dm_pool *mem, struct pv_map *pvm,
uint32_t start, uint32_t count)
{
struct pv_segment *peg;
uint32_t pe, end, area_len;
/* Only select extents from start to end inclusive */
end = start + count - 1;
if (end > pvm->pv->pe_count - 1)
end = pvm->pv->pe_count - 1;
pe = start;
/* Walk through complete ordered list of device segments */
list_iterate_items(peg, &pvm->pv->segments) {
/* pe holds the next extent we want to check */
/* Beyond the range we're interested in? */
if (pe > end)
break;
/* Skip if we haven't reached the first seg we want yet */
if (pe > peg->pe + peg->len - 1)
continue;
/* Free? */
if (peg->lvseg)
goto next;
/* How much of this peg do we need? */
area_len = (end >= peg->pe + peg->len - 1) ?
peg->len - (pe - peg->pe) : end - pe + 1;
if (!_create_single_area(mem, pvm, pe, area_len)) {
stack;
return 0;
}
next:
pe = peg->pe + peg->len;
}
return 1;
}
static int _create_all_areas_for_pv(struct dm_pool *mem, struct pv_map *pvm,
struct list *pe_ranges)
{
struct pe_range *aa;
if (!pe_ranges) {
/* Use whole PV */
if (!_create_alloc_areas_for_pv(mem, pvm, UINT32_C(0),
pvm->pv->pe_count)) {
stack;
return 0;
}
return 1;
}
list_iterate_items(aa, pe_ranges) {
if (!_create_alloc_areas_for_pv(mem, pvm, aa->start,
aa->count)) {
stack;
return 0;
}
}
return 1;
}
static int _create_maps(struct dm_pool *mem, struct list *pvs, struct list *pvms)
{
struct pv_map *pvm;
struct pv_list *pvl;
list_iterate_items(pvl, pvs) {
if (!(pvl->pv->status & ALLOCATABLE_PV))
continue;
if (!(pvm = dm_pool_zalloc(mem, sizeof(*pvm)))) {
stack;
return 0;
}
pvm->pv = pvl->pv;
list_init(&pvm->areas);
list_add(pvms, &pvm->list);
if (!_create_all_areas_for_pv(mem, pvm, pvl->pe_ranges)) {
stack;
return 0;
}
}
return 1;
}
/*
* Create list of PV areas available for this particular allocation
*/
struct list *create_pv_maps(struct dm_pool *mem, struct volume_group *vg,
struct list *allocatable_pvs)
{
struct list *pvms;
if (!(pvms = dm_pool_zalloc(mem, sizeof(*pvms)))) {
log_error("create_pv_maps alloc failed");
return NULL;
}
list_init(pvms);
if (!_create_maps(mem, allocatable_pvs, pvms)) {
log_error("Couldn't create physical volume maps in %s",
vg->name);
dm_pool_free(mem, pvms);
return NULL;
}
return pvms;
}
void consume_pv_area(struct pv_area *pva, uint32_t to_go)
{
list_del(&pva->list);
assert(to_go <= pva->count);
if (to_go < pva->count) {
/* split the area */
pva->start += to_go;
pva->count -= to_go;
_insert_area(&pva->map->areas, pva);
}
}
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